The addition reaction of dimethyl phosphonate to 3,6-di-O-benzyl-1,2-O-isopropylidene-alpha -L-arabino-hexofuranos-5-ulose (11), followed by deoxygenation of 5-hydroxyl group, provided 5-deoxy-5-dimethoxyphosphinyl-D-galactofuranose derivative (13a). Reduction of 13a with sodium dihydrobis(2-methoxyethoxy)aluminate, followed by the action of hydrochloric acid and then hydrogen peroxide, afforded the first D-galactopyranose analog (15) having a phosphinyl group in the hemiacetal ring. This was converted into the 1,2,4-tri-O-acetyl-5-methoxyphosphinyl derivatives (16), whose structure and conformation were established by H-1-NMR spectroscopy.